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上海浦东新区城市森林树冠覆盖分析 被引量:8
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作者 王近秋 吴泽民 吴文友 《安徽农业大学学报》 CAS CSCD 北大核心 2011年第5期726-732,共7页
应用ArcGIS判读2007年遥感影像,分析了上海浦东新区(原)的树冠覆盖。研究区总面积为533 km^2,建成区为252 km^2。结果表明,研究区现有树冠覆盖率7.02%,建成区树冠覆盖率10.27%;其中研究区的潜在树冠覆盖(技术层面)可达8.68%-9.79%,... 应用ArcGIS判读2007年遥感影像,分析了上海浦东新区(原)的树冠覆盖。研究区总面积为533 km^2,建成区为252 km^2。结果表明,研究区现有树冠覆盖率7.02%,建成区树冠覆盖率10.27%;其中研究区的潜在树冠覆盖(技术层面)可达8.68%-9.79%,建成区潜在树冠覆盖率可达到11.49%-12.3%。自商业中心向东树冠覆盖表现城郊梯度的变化,在建成区内自中心城区到城郊边树冠覆盖呈递增趋势,并在外环林带区域达到最高值,之后在城市外侧明显递减。不同功能区的树冠覆盖同样呈现明显差别,外环林带最高,随后是公园、道路、居住区,商业区则最低。根据树冠覆盖估算,浦东新区约有乔木368万株,其中建成区有255万株。建成区至少可增植乔木30万株。 展开更多
关键词 树冠覆盖 城郊变化 城市森林 上海浦东
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Changing Land Use Pattern in India and Its Impact on Supply of Fresh Vegetables
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作者 Darshan Singh Bhupai 《Journal of Agricultural Science and Technology(A)》 2012年第8期952-961,共10页
The investment opportunities created by economic policies and increasing urbanization have enhanced demand for urban and peri-urban land. Fertile agricultural land is being converted to other uses. Around 1/3 more of ... The investment opportunities created by economic policies and increasing urbanization have enhanced demand for urban and peri-urban land. Fertile agricultural land is being converted to other uses. Around 1/3 more of the existing area under forests is needed to meet the targets of national forest policy. In the last two decades, 9% pastures have disappeared. The hills being removed cause threat to environment. The farmers seem to overuse land and other inputs. In the peri-urban areas agricultural fertile lands are many times forcefully acquired for non-agricultural uses, which result in violent protests and judicial interventions. A few cases of vast land use change, motive forces for such change, effect of change in land use on livelihood and on quality and costs of fresh vegetable supply are discussed in this paper. The partially used and unused data collected for earlier studies and some data collected for this paper have been used. The increase in land prices due to enhanced income of some sections, future need of prime land and returns from other than agricultural uses seem to be the driving force for change in land use, affecting the livelihood of people dependent upon farming who are migrating to nearby areas. Each shift of peri-urban agriculture will result in loss of quality, increase wastage by 6% and enhance costs of leafy vegetables by more than 5.5%. For an ideal urban land use, a balanced multi land use policy emphasizing peri-urban agriculture and forestry is suggested. 展开更多
关键词 Land use peri-urban agriculture LIVELIHOOD supply costs fresh vegetables.
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